This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID125X270S, with the same bore, stroke, output force, port and mounting, so it fits the same application. The SAI replacement keeps the same ISO 15552 mounting interface, bore, stroke, output force and accessories, so it drops straight into existing fixtures. It is the current-production version of this cylinder with an upgraded piston seal.
Airtac SID Series Double-Rod Cylinder SID125X270S
The AirTAC Airtac SID Series Double-Rod Cylinder SID125X270S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 270mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID125X270S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke270 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAID125X270S
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SID Series Double-Rod Cylinder SID125X270S
The AirTAC SID125X270S is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends, ensuring push and pull force is equal both ways (5734 N at 0.5 MPa). This discontinued model drops directly into existing ISO 15552 mounting footprints, replaced seamlessly by the SAID125X270S. The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life, while retaining the exact 125mm bore, 270mm stroke, G1/2 port, and M27x2 rod thread.
Because both faces use the identical rod-side area, the equal both ways force eliminates single-rod push discrepancies, making it ideal for anti-rotation guidance or driving two tools simultaneously. The -S suffix indicates a built-in piston magnet for legacy CS1-B/DS1-B switches (the SAI replacement uses current AirTAC switches). Note that air cushions only decelerate near stroke end; an external rod lock or SAIL/BSAI variant is required to hold loads on air loss.
Airtac SID Series Double-Rod Cylinder SID125X270S Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID125X270S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID125X270S |
| Bore size | Ø125 mm |
| Stroke | 270 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2.0 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAID125X270S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
The SAID125X270S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SID Series Double-Rod Cylinder SID125X270S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×270 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SI-family variants: SID (double rod), SIJ (adjustable stroke) — each maps to its SAI equivalent (SID→SAID, SIJ→SAIJ). Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B).
Where the Airtac SID Series Double-Rod Cylinder SID125X270S Is Used
Dual-Tool Drive Station
Simultaneously actuates two opposing machining heads with equal both ways force, leveraging the twin rods to maintain perfect synchronization without differential push.
Anti-Rotation Divert Gate
Uses the double-rod geometry to guide a heavy divert flap without rotational twist, ensuring stable product routing under high-speed cycling.
Symmetric Lift Platform
Drives a vertical lifting edge from both ends, balancing the 292 kg vertical lift capacity evenly across the piston to prevent guide bushing wear.
Replacing the Airtac SID Series Double-Rod Cylinder SID125X270S with the SAID125X270S
To replace the discontinued SID125X270S, install the direct replacement SAID125X270S, which matches the ISO 15552 interface, 125mm bore, 270mm stroke, G1/2 port, and equal both ways force. When sizing both ways, verify that your load does not exceed the 5734 N rating at 0.5 MPa, or step to a 160mm bore if higher force is needed. A double rod is the right choice when you need anti-rotation stability, a back rod to carry a sensor cam, or to drive two mechanisms in opposite directions. Mounting options include FA, LB, and TC brackets. The -S magnet supports legacy CS1-B/DS1-B switches. For this 270mm stroke, ensure adequate side-load alignment to prevent rod binding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID125X270S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SID Series Double-Rod Cylinder SID125X270S FAQ
Yes, the SID125X270S is discontinued. The direct replacement is the SAID125X270S, which shares the identical ISO 15552 mounting interface, 125mm bore, 270mm stroke, G1/2 port, and equal both ways force. The SAI family also adds SAIL and BSAI lock variants.
The G1/2 port delivers equal both ways force of 5734 N at 0.5 MPa, 8028 N at 0.7 MPa, and 10321 N at 0.9 MPa. It features a 32mm rod, M27x2 thread, adjustable 40mm cushions, and a speed range of 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAID125X270S
Send us the quantity and destination. We confirm price, stock and lead time on the SAID125X270S replacement — usually within 7-8 hours.